Question about 2000 Ford F250 Super Duty Crew Cabs
If you have a gas engine truck (4.6L, 5.4L, or 6.8L) the heater core is most likely stopped up. This occurs because of lack of service to the cooling system or services performed without using distilled water in the coolant mix. Minerals dissolved in tap water will deposit on the inside of the heater core (and your radiator) plugging the narrow passages that exchange heat from the coolant to the air passing over the core. Check coolant flow through the heater core. If unable or unsure of how to do this yourself, take the vehicle to a Ford dealer for repair.
Posted on Feb 06, 2010
Check fluid level must be low on coolant or air in system.
Posted on Feb 02, 2010
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Posted on Jan 02, 2017
SOURCE: Heater blows cold air when idle
Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.
Posted on Jan 03, 2009
See my posted question under 2001 Mercury Villager: "HEAT BLOWS COLD WHEN CAR IS IDLING" I got an answer from chuck943 about air pockets and it was very helpful.
Posted on Feb 25, 2009
SOURCE: blowing cold air
I had the same problem that I just fix by flushing the heater core out with a hose. take the two hoses off the fire wall and put the water to it and let flush. my heater is putting out 150 dg. F of hot air. I'm so excited! i will stay warm now.
Posted on Feb 27, 2009
Have you checked the coolant to make sure its full.Try this.Run the truck with the radiator cap off and let it warm up.When it reaches normal temps sqeeze the rubber hoses.These hose should be a little hard to squeeze.If they are the thermo and water pump are fine.
Posted on Apr 28, 2009
Tips for a great answer:
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To troubleshoot this types of problem,click the link below
--------Go through the procedure to confirm the issue.
Engine Overheats and heater blowing cold?
Heat blows cold on drivers side and hot on passenger side?
For car running hot and overheating issues, I suggest to you go
through this help links. Click this link below and go through the
troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?
Car overheats and Air blows hot at idle?
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.
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